91 lude SI MC in 91 DX.

Got it in 15/16's MC, along with a set of cermic pads, brembo blanks and SS lines. Have a problem with the right side caliper though. Its hanging a little bit. I went to the parts store and picked up a new caliper. Didn't come with the part that holds the outside pad. I tried like hell to get that off of the old caliper but eventually gave up, it looks like you need a thin walled socket to get that piece off of the caliper to swap to the new one. 1st question is, am I correct that you need a thin walled socket or is there a trick? 2nd question, where the hell do I get a thin walled socket, or do they sell the entire caliper setup?